321403 has 2 divisors, whose sum is σ = 321404. Its totient is φ = 321402.

The previous prime is 321397. The next prime is 321413. The reversal of 321403 is 304123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321403 - 2⁵ = 321371 is a prime.

It is a d-powerful number, because it can be written as 3⁴ + 2⁷ + 4⁹ + 1 + 0 + 3¹⁰ .

It is not a weakly prime, because it can be changed into another prime (321413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160701 + 160702.

It is an arithmetic number, because the mean of its divisors is an integer number (160702).

2³²¹⁴⁰³ is an apocalyptic number.

321403 is a deficient number, since it is larger than the sum of its proper divisors (1).

321403 is an equidigital number, since it uses as much as digits as its factorization.

321403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 321403 is about 566.9241571851. The cubic root of 321403 is about 68.4988544750.

Adding to 321403 its reverse (304123), we get a palindrome (625526).

The spelling of 321403 in words is "three hundred twenty-one thousand, four hundred three", and thus it is an iban number.